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120820 (1998 HL89)
Classification: Main-belt Asteroid          SPK-ID: 2120820
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .083539636187398 4.0862e-08  
a 2.744883111030839 1.6588e-08 au
q 2.51557657455839 1.1836e-07 au
i 13.52119017020438 4.6007e-06 deg
node 206.9103680287305 1.6711e-05 deg
peri 302.18279567 3.7157e-05 deg
M 50.03895775717485 2.9682e-05 deg
tp 2458969.618059426657
(2020-Apr-30.11805943)
0.00013746 TDB
period 1661.055751995266
4.55
1.5057e-05
4.122e-08
d
yr
n .216729630879377 1.9647e-09 deg/d
Q 2.974189647503289 1.7974e-08 au
  Orbit Determination Parameters
   # obs. used (total)      900  
   data-arc span      8063 days (22.08 yr)  
   first obs. used      1998-04-21  
   last obs. used      2020-05-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55159  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:54:31  

Additional Information
 Earth MOID = 1.55019 au 
 Jupiter MOID = 2.0731 au 
 T_jup = 3.303 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.12   n/a E2021B55  

120820 (1998 HL89)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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